This was a good example of an expandable rich media banner. It is made of 2 separate swf's in its full integration. Here we have a single demo file. The video is CG rendered out and converted to flv. This is played and depending pon the mouse interaction div's are expanded or contracted so that the ad falls within the publisher guidelines.

The first collapsed frame.

A mid frame still.

The final interaction screen.

See the demo ad below (it is not fully functional as it requires the ad serving technology)